American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2018 > 218 > 2 > 227.e1-227.e9
American Journal of Obstetrics and Gynecology > 2018 > 218 > 2 > 236.e1-236.e9
American Journal of Obstetrics and Gynecology > 2018 > 218 > 5 > 506.e1-506.e8